Combustibly-destructible mold core



Patented Sept. 9, 1930 UNITED STATES PATENT OFFICE ARTHUR CHARLES WATERS, F NEWCASTLE, NEW SOUTH WALES, AUSTRALIA V coMBUsTIBLY-nEsTnUoTIBLE MOLD CORE No Drawing. Application filed May 29,

This invention relates to-moldcores for use in casting hollow articles and specially water, gas and like pipes, and has been specially devised in order to expedite, cheapen and improve the manufacture of. combustibly destructible or reducible cores, which will be more efficient in use than those as hitherto manufactured.

Mold cores are built up or formed upon hollow, solid or fluted barrels and consist of an inner, central, or first coat or layer of a combustibly destructible and reducible material and an external layer or covering of 10am.

.5 The improvement consists in producing the combustibly destructible or reducible inner or I first layer of a material consisting of a me chanical mixture of paper, either waste paper or paper pulp, and sand whereby the cost of production is reducedand the combustibility of such layer is increased thus rendering the cores more eiiicient and expeditious in use.

The combustibly destructible or reducible material is produced by grinding paper, either Waste paper or paper pulp, and a small proportion of sand with addition of requisite water, preferably in which clay has been puddled into a fine state in any suitable grinding mill until the resultant material is in a wet mash consistency such as will not flow but will permit the material to be readily spread and applied upon a core barrel and will be of suflicient clinginess, adhesiveness or stickiness to cling and remain and keep its imparted form upon said barrel .as it is applied thereto.

The produced material is formed to requisite thickness upon the core barrel in any con-' venient and suitable manner and if necessary 40 dried or partially dried in convenient manner, whereafter the core is built up to requisite 7 diameter or cross sectional shape or thickness with known material such as foundryloain and then dried for subsequent use.

Cores for angular articles such as bends may be produced upon a core barrel of complementary contour, the improved material being applied thereon and formed to approximate dimensions, the loam covering being applied thereover and trued off in any con- 192 9. SerialNo. 367,143.

venient manner, the formed core then being dried for subsequent use.

I claim A method of forming a mold core which consists in grinding paper, sand and requisite liquid into a moldable consistency, coating the core bar with this composition to form a combustible layer and then applying an external coatin of loam.

ARTHUR dHARLEs WATERS. 

